Because they often sleep during the day
睡觉───sleep;经常───often
a drug that disposes the patient towards sleep───使病人想睡觉的药
You ought to lie in tomorrow and catch up on your sleep.───明天你该晚些起床,多睡会儿.
You can't sleep out; anything might happen to you.───你不能离家外宿, 你有可能出事的.
Nature seems to be wakened from a dead sleep.───大自然似乎从沉睡中被唤醒了.
I think I'll go upstairs and have a sleep.───我想上楼去睡一觉.
I heard you talk in your sleep last night.───昨晚我听见你说梦话.
The convertible sofa means that the apartment can sleep four.───有了这张折叠沙发,公寓里可以睡下4个人.
I yelled in my dream, which startled my roommate out of his sleep.───我梦中的喊叫声惊醒了同屋伙伴.
You'll feel better after a good night's sleep.
I aroused Kyle from his sleep.
Now I shall go to sleep. Good night.
My efforts to go back to sleep proved futile.
I can't sleep in the daytime.